Screw-driving chuck



Jan. 8, 1929.

F. H. WOOD SCREW DRIVING CHUCK Filed Jan. 26, 1926' A I-Ih I L INVENTOR.

mwmf (Ma/fm@ Patented Jan. 8, i929.

i ineen l FREDERICK H. VVQQD,` F CHICAGO, ILLINIS.

scnnw-:onivine entren.'

VApplication filed January 26, 192.6. Serial No. 8?),835;

They hold the screw firmly. against ar shoulder formed by theextremity of an ateven bearing for the top surfacel of the head' of the screw to hold the screw in alignment" tachment on the driver which` has a slight play longitudinally to enable the tonguey or.,y

bit of the driver to bear fully in the slot ofthe screw. The shoulder is formed for either .a flat or a round headedscrew and 'aiords an with the driver, the shoulder of the attachment, being within the circumference of the screw head, is enabled to iollowy the-screw into a counter-sink.

`ing a rotating and a longitudinal movement The claws are borne by an outer sleeve havon the driver and its attachment. The clawsare fastened to the outersurface ot the outerv sleeve and extend inwardly through slots, or perforations in the lower part of the outer sleeve to grip the screw.V

This outer sleeve extends beyond the claws to engage the head of the screw and keep the screw centered on the bit, and when the screw is nearly driven, touches the material the screw enters, ceases to revolve vwith the' driver and moves backward on the driver releasing the claws and carrying themkbarck on thedriver as the screw is driven home.

The attachment to the driver comprisesan.

inner sleeve slidable on the shank of the blade and having opposed Yvertical slots formed to receive and guide the shoulder of the blade,

and when the outer sleeve moves backward on the driver, automatically pushed backward by contact with the material into which the screw is being driven, it draws the claws Y freefrom the screw and causes them to rest on the innersleeve, leaving the end vor" the extremity of the outer sleeve open forthe insertion of another screw. The movement of the outer rsleeve in the direction of the 'bit causes ythe claws to glide from their resting place and over the head of the screw, engaging the screw. y

Means is provided for adjusting the length of the outer sleeve, enabling the claws to eX- tend further beyond the shoulder of the inner sleeve, to embrace screw heads Vof various thicknesses.

There is also means for holding the driver The screw driving chuck is adaptable for.V a handle, or ratchet or brace, or witha lieXible shaft, the purpose being to'facilitatethe drivof screws without moving hthe work; Having described the purpose of my in-l vention, the nature Vof which will be fully `understood,from the description I give below when considered in connection with the drawing in which the same letter denotes similar parts in each ligure. l l y Figure l shows the screw driver with the attachment which forms the shoulder or bearing Vfor the top surface of the screw head and which T designate as the inner sleeve.

Figure 2 shows the driver. i K, l Figure 3 shows a modification of the device shown in the remaining iigures and in which modified ormv may be used without claws attached to the outer sleeve.

Figure 4 shows the complete screw drivshank designedfor. a ,handle or brace and its y, lower extremity flattened out to it into the opposed vertical slots inthe linnersleeve I-l,

land having a shoulder tor the inner sleeve to rest upon limit-ing. its movement. The lower extremity terminates in atongue or bit toengage the screw.

` The longitudinal v'movement of the inner sleevey lon the driver is limited also bythe lugU pinned on the driver. AThe innersleeve also has a lug T which engagesv a progection from the outer sleeve. .The lower extremity et the sleeve H which is bored throughout lto tit the driver A forms a shoulder l? against,Y

The inner surface' of this vshoulder may' be slightly tapered o1'V concave to conform -to the top surface et a which the yscrew isheld.

round headed screw, whileits'outer surface VV:forms the shoulder for the Atopsurtace ot a flat headed screw. Y

The driver A. shown in Figure 2 with a shoulder to engage theV inner sleeve H.

Tn Figure 3 the driver A with its inner sleeve H is encased in an outer sleeve C which extends below the shoulder P to engage the can beV formed like the ordinary screw driver but 

